Hi
Marcella,
The 1851 Census entry for the family reads as follows:
1851:Renfrewshire,
Greenock(Middle):
At 24
Regent Street:
-Prudence
GOWANS,mar.,wife,44,Seaman's Wife,b.Ayrshire,
Irvine.
-Andrew,son,unm,15,Scholar,b.Renfrewshire,
Greenock.
So it would look as if there were no kids after Andrew,and if there were any before him,either married (girls),or maybe at sea (boys),or deceased.The person Index for this census for
Greenock and district does not list any likely candidates as siblings,unfortunately.
Regards,Chris.